qiskit.quantum_info.entanglement_of_formation

entanglement_of_formation(state)

Calculate the entanglement of formation of quantum state.

The input quantum state must be either a bipartite state vector, or a 2-qubit density matrix.

Parameters

state (Statevector orDensityMatrix) – a 2-qubit quantum state.

Returns

The entanglement of formation.

Return type

float

Raises

• QiskitError – if the input state is not a valid QuantumState.
• QiskitError – if input is not a bipartite QuantumState.
• QiskitError – if density matrix input is not a 2-qubit state.